Tooth Build-Up And Hardsurfacing - Labounty CP 80 Safety, Operation & Maintenance Manual

CONCRETE PULVERIZERS
TOOTH BUILD-UP
AND HARDSURFACING
See the table on page 5-15 for the part numbers for
Swift-Lock build-up templates. If desired, Swift-Lock
Teeth can be built up and hardsurfaced to increase
their life. Depending on the situation, it may be more
cost-effective to replace the teeth when they be-
come worn rather than build them up. Build-up and
hardsurface the teeth when there will be adequate
time for them to cool slowly before they are put back
into service. Use the following process to build up
and hardsurface the teeth.
1. Clean all dirt and grease from the areas to be built
up. If any old hardsurfacing still exists, remove it
down to the base metal by grinding.
2. Place the build-up template along the tooth to de-
termine the amount of build-up required (fi gure 4-5).
Build-up templates can be ordered from LaBounty.
3. Preheat the tooth to about 200ºF (100ºC) to
remove moisture. Preheat the area to be built up
to 300-400ºF (150-200ºC). DO NOT exceed 450ºF
(230ºC). Use a temperature stick to test the area
frequently, because overheating can harm the tooth.
Temperature sticks are available from LaBounty.
4. Using AWS E7018 welding rod or equivalent,
make side-by-side passes down the face of the cut-
ting edge until the area is covered. Stress relieve and
remove slag after each pass by peening vigorously.
Continue to do this until the profi le of the tooth
matches the template as closely as possible. Grind
the edges square to match the template profi le.
NOTICE
Check the temperature often during this procedure
to maintain 300-400ºF (150-200ºC). Do not exceed
450ºF (230ºC).
Page 10 Section 5 Maintenance
BUILD-UP TEMPLATE
FIGURE 5-5
• Remove paint before welding or heating.
Hazardous fumes can be generated when paint is
heated.
• When sanding or grinding paint, do not breathe
the dust. Wear an approved respirator.
• If you use solvent or paint stripper, remove the
stripper with soap and water before welding.
• Remove solvent or paint stripper containers and
other fl ammable material from the area.
• Have a fi re extinguisher nearby during all cutting
and welding operations. Clean areas to be cut or
welded of oil and fl ammable materials. Protect all
fl ammable areas from sparks.
• Do all work in a well ventilated area. Dispose of
paint and solvent properly.